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llms.txt · MCP 가이드개인정보처리방침 · 이용약관 · 지원v1.8.0
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1,5-Dibromopentane → (R)-(+)-6-[(5-bromopentyl)oxy]-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester

HRID 2232495
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HRID 2232495 반응식
[CH3:1][O:2][C:3]([C@@:5]1([CH3:19])[CH2:10][CH2:9][C:8]2[C:11]([CH3:18])=[C:12]([OH:17])[C:13]([CH3:16])=[C:14]([CH3:15])[C:7]=2[O:6]1)=[O:4].C(=O)([O-])[O-].[K+].[K+].C1OCCOCCOCCOCCOCCOC1.[Br:44][CH2:45][CH2:46][CH2:47][CH2:48][CH2:49]Br>O.CCOCC.C(#N)C>[CH3:1][O:2][C:3]([C@@:5]1([CH3:19])[CH2:10][CH2:9][C:8]2[C:11]([CH3:18])=[C:12]([O:17][CH2:49][CH2:48][CH2:47][CH2:46][CH2:45][Br:44])[C:13]([CH3:16])=[C:14]([CH3:15])[C:7]=2[O:6]1)=[O:4]
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참가 물질

8

반응물 4

HCID 81001,5-DibromopentaneHCID 11430Potassium CarbonateHCID 2855718-Crown-6HCID 14308591(R)-(+)-methyl 3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylate

생성물 1

HCID 14329716(R)-(+)-6-[(5-bromopentyl)oxy]-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester

시약·촉매·용매 3

HCID 962
Water
용매
HCID 3283Diethyl Ether용매
HCID 6342Acetonitrile용매

실험 절차

A mixture of 6.5 g (24.6 mmoles) of (R)-(+)-6-hydroxy-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester, 10.37 g (75.1 mmoles) of anhydrous potassium carbonate, 1.12 g of 18-crown-6, 39.3 ml (0.2 mole) of 1,5-dibromopentane, and 150 ml of acetonitrile was stirred and refluxed for 21 hours. After being cooled, the mixture was treated with ether and water. The organic layer was separated, washed with water and brine, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue (68 g) was purified first by column chromatography on silica gel (400 g; eluting with 49:1 toluene-ethyl acetate) and then by preparative HPLC on silica gel using 9:1 hexane-ethyl acetate as the mobile phase. There was obtained 9.71 g (95.6%) or (R)-(+)-6-[(5-brompentyl)oxy]-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester as a solid. Recrystallization from ethanol gave a colorless solid mp 64°- 65.5° C., [α]D25 +36.37° (c 2, CHCl3).

후처리

  1. temperaturerefluxed for 21 hours
  2. temperatureAfter being cooled
  3. customThe organic layer was separated
  4. washwashed with water and brine
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customThe residue (68 g) was purified first by column chromatography on silica gel (400 g; eluting with 49:1 toluene-ethyl acetate)

출처 및 근거

ORD 기록
ord-a7ff44945d974caabaee27066cec27cc
출처 데이터셋
uspto-grants-1988_11
DOI
10.6084/m9.figshare.5104873.v1
특허 번호
US04788214

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